Rook drilling machine



fmo Model.) 1o Sheets- 8inch 1. I

E. MOREAU.

ROCK DRILLING MAGHINE.

No. 440,745. Patented Nov. 18, 18 90.

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(No Model.) 10=SheetsSheet 2.

. MORE AU 4 ROCK DRILLING MACHINE.

No. 440,745. Patented Nov. 18, 189.0.

lniii'fl @lamag (No Model.) 10 Sheets-Sheet 3. E. MOREAU. ROCK DRILLINGMACHINE. .No. 440,745. Patented Nov. 18,1890.

llilllllix (No Model.) 10 Sheets-Sheet 4. E. MOREAU.

ROCK DRILLING MACHINE.

Patented Nov.

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(No Model.) 10 Sheets-Simet 5.

E. MOREAU. ROGK DRILLING MACHINE.

Nu-440,745. Patented Nov. 18, 1890.

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(No Model.)

10 Sheets-Sheet 6. E. MORBAU. ROCK DRILLING MACHINE.

Patented Nov. 18, 1890.

(No Model.) 10 Sheets-Sheet 7; E. MOREAU.

. ROCK DRILLING MACHINE.

No. 440,745. Patented Nov.- 18, 1890.

(No Model.) 10 Sheets-Sheet 8. E. MOREAU.

% ROCK DRILLING MAGHINE.

No. 440,745. Patented Nov. 18, 1890.

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nted Nov. 18, 1890.

(No Model.)

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(No Model.) 10 Sheets-Sheet 10.

E. MOREAU. ROCK DRILLING MACHINE.

No. 440,745. Patented Nov. 18, 189 0.

fnvaniarr Ewe flared l9 UNITED STATES PATENT OFFICE,

EUGENE MOREAU, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THEODORE IV.STERLING, OF NE\V YORK, N. Y.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 440,745, dated November18, 1890.

Application filed March 19, 1890. Serial No. 344,473. (No model.)

To all whmn it may concern:

Be it known that I, EUGENE MOREAU, a citizen of France, residing atPhiladelphia, in the county of Philadelphia and State of Pennsylvania,have invented certain new and useful Improvements in Rock-DrillingMachines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to rock-drilling 1na chines, and particularly tothatclass in which blows are struck upon the drill-tool or a partholding it and in which the drill-tool is rotated between the blows.

The object is to provide a rock-drilling machine which shall be compact,comparatively light, and simple and inexpensive of construction, capableof operation with expenditure of a minimum amount of power, and capableof being rapidly and conveniently manipulated to bring it into anydesirable position for use; furthermore, to accomplish the rotation ofthe tool or part holding the tool in a simple and elficient manner;furthermore, to accomplish forward feed of the machine automatically,and, finally, to accomplish the forward feed automatically, but causethe forward movement to be checked automatically should the advance beproportionately too rapid.

. With these objects in view the invention consists in the combination,with a drill and the operating mechanism of a striking device therefor,of means connected with the operating mechanism which will cause apartial rotation of the drill-tool between blows; furthermore, in thecombination, with a drill and the operating mechanism of the strikingdevice therefor, of means connected with the operating mechanism actingautomatically to accomplish forward feed of the machine, and, finally,in the combination, with a drill and the operating mechanism of astriking device therefor, of means connected with the operatingmechanism for accomplishing the forward feed of the machineautomatically and for checking the advance automatically when thisbecomes too rapid. V

The striking device, consisting of two hamwhich permit the drill to betilted up and 1 down and turned'or shifted around, and also to be movedlongitudinally or to slide, the striking mechanism to which thisrock-drilling mechanism is here, for more illustration of a mode of use,shown attached being in a housing (the cover of which is removed)projecting backward from the tube of the drill, the view showing the endof the drill-shaft, the tube, the sleeve, the standard, and its collar,and also a rock-shaft outside of the housing of the striking mechanism,this rock-shaft having an arm at one end projecting laterally into thehousing and toothed at its end, as shown in Figs. 2 and 3, to mesh witha segmental gear loose at the upper part of the drillshaft, as shown inFigs. 2, 3, 4, and 6, and having a lateral extension at its other endtaken under by a cam on the main shaft of the striking mechanism, asseen more fully in Figs. 2-

and 7, a boxing over the main shaftbeing cut away to show the extensionfrom the rockshaft of the drill and the cam on the shaft of the strikingmechanism, the striking device, to which the drill is here applied,havingits hammers so arranged in connection with the driving-shaft thatupon rotation of the drivingshaft actuating the rock-shaft the drilltool or shaft in which it is fixed will be given a partial rotationbetween the blows, the striking device here being one with two hammersarranged one above the other, there being seen the upper hammer with twostems and two actuating-springs-one on each stempart of two portions-aforward projecting portion anda rear or upright portion-bf a movableframe in which the hammers are mounted, one of two longitudinal tonguesor guide-ribs for each hammer on the forward-projecting portion of thisframe employed with grooves in the hammers to steady the hammers andhold them inproper position against individual displacement to or fromthe line of stroke and the place of one of two upright groovesone ateach side of the rear or upright portion of this movable frame-as shownin detail in Fig. 15, to take upon upright guidebars on a stationaryframe or a block having a recess or jaw, as more fully shown in Fig. 14,to receive the movable frame, and provided with upright guide-barsextending inward, upon which the movable frame slides by the grooves inits sides, upper pawl springs to operate in connection withlocking-levers or roller-pawls, as shown in Fig. 13, and a cleft in theblock from above downward to receive an arm fixed to and projectingbackward from the movable frame, as shown in Figs. 6 and 15, into a boxon a crank or crank-bend on a second shaft, as shown in Figs. 2, 6, 7,8, and 12, by which the movable frame is actuated to reciprocate fromthe crank or crankbend on the second shaft by means of the box; also,the main shaft, and, finally, a sec ond shaft above the main shaft withgearwheels. Fig. 2 is a top plan view represent ing the operation ofthe'means for rotating the drill-shaft and part of the means foraccomplishing automatically feed forward of the drill and automaticarrest thereof, the cover of the striking mechanism being off, the stemsof the upper hammer and the actuating-springs removed, and the end ofthe drill-tube broken off, showing part of the tube and its sleeve, therook-shaft outside of the housing of the striking mechanism, thecrank-arm at one end projecting laterally into the housing and toothedat its end meshing with the segmental gear loose at the upper end of thedrill-shaft, a spring attached to the crank-arm and the housing to throwthe crank-arm and the segmental gear back, as more fully shown in Fig.3, after it has been moved down by the turning of the rockshaft from itsextension by the cam on the main shaft, and a lateral extension at theother end of the rook-shaft taken under by the cam on the main shaft ofthe striking mechanism, showing, also, part of a longitudinally-movableconnecting-frame, (seen fully in Fig. 9,) through which means actuatedfrom the operating mechanism and acting to accomplish forward feed ofthe machine are automatically disconnected from or connected with thedrill-tool, or are disconnected or connected by hand, theconnectingfra-me having a pin at the front end set into a well or holein the drill-casing, as shown fully in Fig. 9, pins at the other end toenter wells or holes in the casing, these pins being surrounded bysprings bearing against the connecting-frame and the housing to keep theframe normally pushed forward of the striking mechanism, there appearingthe head of one hammer, part of the two portions of the movable frame inwhich the hammers are mounted, an upper set of tubes set in the uprightportion and into which the stems of the hammers slide, the place of thegrooves in the rear or upright portion, which g ooves take upon uprightguide-bars on the stationary frame or block, the top of the stationaryframe or block, into a recess of which the upright portion of themovable frame is set, the upright guide-bars extending inward, and uponwhich the grooves in the stationary frame take, the upper pawl-springsto operate in connection with the locking-levers or roller-pawls, asshown in Fig. 13, the situation of the cleft in the block from abovedown ward, the arm fixed to and projecting backward from the movableframe through this cleft. into a box on a crank or crank-bend on asecond shaft, as shown in Figs. 6 and 12, by which the movable frame isactuated to reciprocate, gear-wheels and cranks on the second shaft tooperate with links to draw back the upper hammer, as shown in Fig. 11,and, finally, the main shaft and studs bracing the stationary frame inthe housing. Fig. 3 is a View in elevation looking at and into thehousing of the striking mechanism between the end of theforward-projecting portion of the movable frame and the upper end of thedrill-shaft, with the housing, the rock-shaft, and a tube at the underpart of the housing for containing a feed-screw and aninteriorlyscrew-threaded tube, as shown in Fig. 6 in section, the viewrepresenting in detail the means from the shaft-rock of giving a partialrotation to the drill-shaft between the blows of the hammers, showingthe rock-shaft, its crank-arm projecting into the housing, having thespring to throw it up and toothed at its end meshing with the segmentalgear, being a number of spur-teeth on the rim of the enlarged end orhead of a gear-shell loose upon a ratchet-shell, as seen in Fig. 5, onthe upper end of the drill-shaft, this gear-shell having, furthermore,the front part of a portion of its rim orcircumference of its head cutaway, leaving a flange at the back for a hanger or depending plate totake against to hold the shell against displacement inward, showing,also, the hanger or plate depending from the end of the housing, theflange of the wheel being set behind it, the head or face or wheel ofthe ratchet-shell, (shown in Fig. 5,) which shell is held upon the upperend of the drillshaft by short feathers projecting toward the centerfrom the head, taking into long grooves in the drill-shaft, as seen inFig. 5, causing the ratchet-shell to turn within the shaft, but leavingthe shaft free to move longitudinally independently of theratchet-shell-that is, to slide in it-a ratchet or feed pawl projectingtoward the center from the gear-shell head and pushed by a spring, asshown in Fig. 4, taking against a tooth of the ratchetwheel, andshowing, finally, a stop-pawl with its spring, this pawl being pivotedto the casing and taking'through a slot (shown fully in Fig. 4) in therim of the head of the gearshell against a tooth of the ratchet-wheel toprevent the ratchet-shell from turning backward. Fig. 4 is a View partlyin section and partly in elevation, being a vertical centrallongitudinal section through the head of the gear-shell, having itsratchet orfeed pawl and spring and the ratchet-shell on the end of thedrill-shaft in front elevation, showing particularly, the spring to thefeed-pawl secured in a countersink on the rim, the slot through whichthe stop-pawl passes, and the flange. Fig. 5 is a View in vertical anddiagonal or angular longitudinal section, taken on the line 00 a: ofFig. 4, showing the drill-shaft having surface-grooves into which thesplines or feathers of the ratchet-wheel are set fora short distance tohold the wheel on the shaft against turning independently thereof, butleaving the shaft free to slide orbe pushed back,showing, furthermore,the ratchet-shell with head and body, the head having the feathers orsplines and the body a cleat at its end to take against the body of thegear-shell to hold the ratchet against displacement inward; furthermore,the gear-shell with head and body, the head having the countersink forsecurement of the feed-pawl spring, the spring being in place, andshowing, finally, the flange. Fig. 6 is a view in vertical longitudinalsection, taken through the rock-drilling mechanism and through thehousing of the striking mechanism attached thereto, the end of therock-drilling mechanism being broken away, leaving in elevation,segmental of the drillshaft, the part gear-wheel with depending plate tohold it against displacement inward, the feed-screw for the drill, a rodin the easing of the drill-tool attached at its outer or lower end tothe drill-shaft by means of a projection therefrom to be movedlongitudinally thereby, as shown in Fig. 9, a part of the front pin fromthe longitudinally-movable connecting-frame, part of thisconnecting-frame and a cam-shaft with cam to enable the shaft to bepulled back by hand; furthermore, leaving in elevation of the strikingmechanism the hammers to display their shape, their springs, the stemappearing of the lower one, and its tube, (more fully seen in Fig. 13,)the view representing the means for producing forward feed of themachine and parts of the means for automatically arresting the feed inconformity with the work to be performed, showing part of thedrill-shaft, its upper end with the grooves, the body of theratchetshell with its cleats, the body of the gearshell, and a sleevescrewedinto the end of the housing for sustaining the shaft and shells;furthermore, the tube and its sleeve, an internally-screw-threaded tubefixed thereto, a tube in the lower part of the housing of the strikingmechanism which the first tube enters and in which it is free to slide,and a screw threaded shaft entering the screwthreaded tube, this shaftbeing free to turn in the housing, but being fixed therein againstlongitudinal motion, whereby upon turning the shaft in one direction orthe other the machine will be advanced or retired on its standard;showing, furthermore, a skew gearwheel (seen fully in Fig. 9) fixed upona collar loose upon the screw-shaft in connection with a collar behindit turning with the screw-shaft by means of a spline and groove, butfree to move on the shaft longitudinally, as more fully shown in Fig. 9,and also askew gear-wheel on the main shaft, as more fully seen in Figs.7, S, and 9, from which the skew gear-wheel on the loose collar on thescrewshaft is turned, and by which, when it is connected with thespline-collar behind it, as more fully shown in Fig. 9, the shaft willbe turned, but which will turn idle when it is not connected with orattached to the splinecollar; showing, also, part of thelongitudinally-movable connecting-frame with its front pin projectingthrough the front of the housing into the tube of the drill, the rearcrosspiece of the frame taking intoa groove in the spline-collar behindthe skew gear-wheel on the screw-shaft, whereby when the frame is movedbackward the spline-collar will be moved backward out of engagement withthe loose collar or collar of the skew gear-wheel, letting thisgear-wheel turn idly on the screwshaft and the screw-shaft be stopped,stopping the feed, and when the frame is pushed forward by the springs(seen in Fig. 2) the spline-collar will be thrown into engagement withthe loose collar on the skew gear-wheel, causing the screw-shaft to beturned therefrom, actuating the feed; showing, also, part of a rod inthe casing of the drill-tool, which rod at its upper end abuts againstthe front pin of the connecting-frame and at its lower or outer end isattached to the drill-shaft by means of a projection therefrom to bemoved longitudinally thereby, as shown in Fig. 9, pushing the drillbackward against a spring, (not shown, but seen in Fig. 9,) as byexcessive resistance, thus stopping the feed automatically; also showinga small shaft with a cam on its inner end taking over the rearcross-piece of the frame and a handle to actuate it, whereby the framemay be pulled back by hand to stop the feed, and showing, also, thesegmental gear-wheel with flange, countersink, and pawl-spring screwtherein, and the depending plate against the flange holding the wheelagainst displace ment of the striking mechanism, there appearing theupper and lowerhammers and one each of their actuating-springs, theupper hammer being drawn back and the lower one extended, having justdelivered its blow, a stem of the lower hammer and one of the tubesfixed in the movable frame, into which tubes the, stems of the hammersare received and in which they slide, as shown fully in Fig. 13, themovable frame in which the hammers are mounted, its arm in position, andpart of one of the recesses for the locking-levers or rollenpawls with alower pawlspring, as shown fully in Figs. 13 and 15, and, finally,showing the stationary frame or block with the lower part of one of theupright guide-bars, the main shaft, and the second shaft carrying thebox, the free end of the arm extending into the box, whereby' themovable frame is reciprocated from this second shaft. Fig. 7 is a viewin elevation, the end of the housing being removed to display the partsrepresenting the rear of the striking mechanism, with means from theoperating mechanism thereof of actuating the feed of the machine androtating the drill,

showing upon the main shaft a skew gearwheel (seen again in Fig. 8) formeshing with and driving the skew gear-wheel upon the loose collar onthe screw-shaft employed to advance or retire the drill on the standard,as seen in Fig. 9; showing, also, the cam on the main shaft and the endof the rock-shaft with its lateral extension, and, finally, the openingin the lower part of the housing for the screw-shaft of the strikingmechanism, there appearing part of the stationary frame, being uprightstrips or pieces confining the shafts at their hearings in the frame,the common main shaft with its gear-wheels for driving the strikingmechanism, between which is the skewgear-wheel for actuating the feed,

and a second shaft with its gear-wheels, the

gear-wheels 011 the second shaft intermeshing in pairs, the box on thesecond shaft with the arm from the movable frame projecting through it,and, finally, the sides and bottom of the housing with attachments forthe rear plate. Fig. 8 is aview in perspective representing the maindriving-shaft with means for actuating the feed of the machine and therotation of the drill, showing the skew gear-wheel and the cam, thereappearing also the gear-wheels for driving the striking mechanism andcrank-bends to connect through links with pins on the head of the lowerhammer to draw the hammer back against its spring or springs, as fullyshown in Fig. 11. Fig. 9 is a view in perspective with a portion of thedrill-tube removed to display parts therein and the drill-shaft and tubebeing cut off outside of or beyond the situation of the shells,representing in detail the means for automatically causing and forautomatically arresting the feed of the machine on its standard, showingthe tube and its sleeve, the outside of the internally-screw-threadedtube fixed to a bracket on the sleeve, the rear end of the screwthreaded shaft which enters the screw-threaded tube, the skew gear-wheelfixed upon a collar loose upon the screw-shaft, a collar behind ithaving a groove which takes upon a spline on the screw-shaft, so that itturns with the screw-shaft, but is free to move on the shaftlongitudinally, the two collars being provided with teeth on theiradjacent edges, forming a clutch, the skew gear-wheel on the main shaftset at an angle to and meshing with its fellow on the screw-shaft, thelongitudinally-movable connecting-frame with its front pin projectingthrough the front of the housing into the tube of the drill and withrear pins provided with springs, the rear cross-piece of the frametaking into a groove in the spline-collar b hind the skew gear-wheel onthe screw-shaft, whereby when the frame is moved backward thespline-collar will be moved backward out of engagement with the loosecollar or collar of the skew gear-wheel on the feed-shaft, letting thisgear-wheel turn idly on the feed-shaft and the screw-shaft be stopped,stopping the feed, and when the frame is pushed forward by the springsthe spline-collar will be thrown into engagement with the loose collaron the skew gear wheel, causing the screw-shaftto be turned therefrom,actuating the feed; showing, also, part of the drill-shaft with aprojection at its lower end, the rod in the casing of the drill-toolabutting at its upper end against the front pin of the connecting-frameand at its lower or outer end attached to the drill-shaft by means ofthe projection therefrom'to be moved longitudinally thereby, a diskfixed in the tube, but free on the drillshaft, a spring on thedrill-shaft between this disk and the projection, an enlargement orfixed collar on the drill-shaft bearing against the projection, and,finally, an end bearing for the drill-shaft screwed into the tube,pushing the drill backward against the spring, as by excessiveresistance, thus stopping the feed automatically. Fig. 10 is a view,partly in elevation and partly in section, showing the end of thedrill-shaft with a square socket screwed upon it to receive and hold thedrill-tool. Fig. 11 is a view in side elevation, the housing beingremoved, representing the manner of drawing back the hammers againsttheir springs, showing the hammers with one of the pins on the head ofeach, and the actuating-springs, the hammerstems, the tubes, and part ofthe movable frame being indicated by dotted lines, one of the grooves inthe hammers employed with the longitudinal tongues or guide-ribs on theframe to steady the hammers and hold them in proper position againstindividual displacement to or from the line of stroke, part of themovable frame, part of the stationary frame or the block, the end of themain shaft in full lines, and in dotted line the end of the secondshaft; furthermore, the gear-wheels on the shafts, one of the cranksthat are on the ends of the second shaft, and (of the links connectingthe cranks with the hammer-heads bythe pins) the links on this side, theposition of the links being such that while the crank on the secondshaft is back, having drawn the hammers backward against its spring orsprings,to be held by mechanism not seen, but shown in Fig. 13, thecrank on the lower shaft will be forward, and vice versathat is to say,the two shafts being so geared that their cranks will be held, re-

spectively, in positions relatively diametrically opposite, and eachlink having an opening of sufficient length to permit its hammer todeliver full stroke upon being released, there also appearing in thisfigure the cam on the main shaft. Fig. 12 is a view in perspectiverepresenting in detail the means of moving the arm up and down toreciprocate the movable frame, showing the second shaft with the box(seen in Figs. 2 and 7) on a crank in the length of the shaft and thearm belonging to the movable frame, with a groove and projections forits securement; showing, also, the gear-wheels of the second shaft and acrank for attachment of a link. Fig. 13 is a view in verticallongitudinal section, taken through the fore part of the stationaryframe and the rear portion of the movable frame in the line of a stemeach for the upper and lower hammers, leaving the stems (broken awaytoward the hammers) in elevation, as well as locking-levers orroller-pawls, pawlsprings, and a guide-bar, the casing being removed todisplay the parts, showing a stem of each hammerprovided with a notchfor receiving a roller of a locking-lever or rollerpawl, part of themovable frame carrying the tubes in which the stems slide, and thelocking-levers or roller-pawls, and part of the stationary frame withthe pawl-springs, a stop for the locking-levers of roller-pawls tostrike to be released from the notches in their respective stems,and anupright guidebar. Fig. lat is a view in perspective representing thegreater portion of the stationary frame on the block, in a front recessor jaw of which the movable frame carrying the hammers slides, showingthe recess or jaw provided wit-h upright guide-bars extending inward fortaking into the grooves in the sides of the movable frame, the upper andlower pawlsprings to operate in connection with the locking-levers orroller-pawls, the stops for thelocking-levers to strike to release thehammers, the cleft from above downward to receive the arm fixed to andprojecting backward from the movable frame through this block into thebox on a crank on the second shaft, and depressions at the back of theframe to form portions of the bearings of the main and second shafts;and Fig. 15 is a view in perspective representing the greater portion ofthe movable frame in which the hammers are mounted, showing the recessesfrom above downward and from below upward rounded within and holding theback ends of the tubes into which the stems slide, the recesses havingthe locking-levers or roller-pawls in position, (the locking-levers orroller-pawls being seen in three of these recesses,) and upright groovesat the sides to take upon the guidebars on the stationary frame and thearm in position in the frame by which the frame is actuated.

In the drawings, H represents the drill-shaft in a tube H supported on astandard I by a sleeve h and collar 1', which permit the drill to bemoved longitudinally or to slide on the standard and also to be tiltedup and down and turned or shifted around. At its upper end thedrill-shaft is provided at its surface with longitudinalgrooves h andupon this end is a shell which I call the ratchet-shell, consisting'of ahead portion 71 provided circumferentially with ratchet-teeth and a bodyportion 71*, the shell being secured upon the shaft in such manner as toturn with it, but yet to slide thereonthat is, allow the shaft to bemoved longitudinally without moving the shellthe securement being byshort feathers or splines h, which project from the head portion towardthe center into the grooves in the shaft, the feathers filling thegrooves in width, but not filling them in length. Upon the end of itsbody portion the ratchet-shell is provided with a cleat h, takingagainst the end of the body of an outer shell, for a purpose presentlyto be explained. Surrounding the ratchet-shell and turning looselythereon is this outer shell, which I call the gear-shell, having a headportion 72/ and a body portion 71. the head portion being provided at apart of its circumference with spur-teeth h and being cut away at thefront portion at another part 71 of its circumference, leaving a flange72 at the back for a hanger or plate 71, depending from the housing ofthe striking mechanism, to take against to hold the shell againstdisplacement inward. The gear-shell has a feed-pawlh set through anopening in the rim and projecting toward the center, and this pawl takesagainstone of the ratchet-teeth on the head of the ratchetshell, thepawl being held in engagement by a spring 72., set in a countersink 71in the rim. At a portion of the circumference opposite the teeth the rimof the head of the ratchet-shell has an openingorslot h through whichtakes a stop-pawl h against a ratchettooth, the stop-pawl being pivotedto the housing and having a suitable spring. It will now be clear thatas the depending plate prevents the gear-wheel from being displacedinward and as the cleat on the body of the ratchet-shell bears againstthe end of the body of the gear-shell this cleat serves to keep theratchetshell also from displacement inward. The upper end of the shaftand the shells are set and turn in a sleeve h, screwed into the up erend of the tube. V

Mounted laterally outside the housing of the striking apparatus is arock-shaft K, having a crank-arm 7o projecting into the housing andprovided with a spring fixed at one end to the housing and at the otherend to this arm to throw the arm up, the arm having teeth It" at its endmeshing with a segmental gear, being the spur-teeth h on the rim of thehead of the gear-shell. At the other end the rock-shaft has a lateralextension 7.5 which is taken under by a cam e on the main shaft E of themachine. It will be obvious that as the main shaft revolves the camcoming under the extension at the rockshaft will move this, causing fromits arm a partial rotation downward of the gear-shell, by the feed-pawlof which the ratchet-shell will be turned to the extent of one tooth,giving this extent of the turn to the drill-shaft, while as soon as thecam escapes from under the lateral extension of the rock-shaft thespring on the crank-arm will throw the arm up, giving a partial rotationto the gear-shell in the opposite direction, thus bringing its pawl intoengagement with a higher tooth, the stop-pawl acting to retain theratchetshell in position while the feed-pawl is out of contact with atooth. The position of the cam upon the drilling-shaft is such withrelation to the actuating mechanism of the st riking device and itsoperation so timed with relation to the operation of the hammers thatthe drill-shaft will be given a partial rotation between the blows ofthe hammers.

To the sleeve h of the tube H preferably to a bracket projecting fromthe sleeve, is attached an internally-screw-threaded tube L, and thistube enters and is free to slide in another tube M in the lower part ofthe housing of the striking mechanism, and entering the other end of thescrew-threaded tube through the tube in the housing is a screwshaft N,free to turn in the housing, but fixed therein, as by a collar abuttingagainst an of"- set in the tube against longitudinal motion, wherebyupon turning the shaft in one direction or the other the machine will beadvanced or retired on its standard. This screwshaft has upon it a loosecollar n, provided at its rear with teeth, and formed with or fixed tothis loose collar is a skew gear-wheel n Behind the collar 41, is asecond collar a pro vided at its front end with teeth and arranged toturn with the screw-shaft by means of a spline and groove or thelike,but free to move on the shaft longitudinally. Upon the main shaft E isanother skew gear-wheel e, from which the slanting toothed gear-wheel onthe loose collar on the screw-shaft is turned, and by which, when it isconnected with the spline-collar behind it by the teeth on both, theshaft will be turned, but which will turn idly when it is not connectedwith or attached to the spine-collar.

In the lower part of the housing is a connecting-frame O, capable oflimited longitudinal movement, through which frame the screw-shaft isautomatically thrown into action to accomplish forward feed of themachine or automatically stopped to discontinue the feed, the rearcross-piece of the connecting-frame takinginto a groove 72 of thesplinecollar, so that the spline-collar can be moved longitudinally onthe shaft by the frame. Projecting backward from the frame are pins 0,which enter suitable holes in the housing, and upon these pins betweenthe housing and the end of the frame are spiral springs 0 which tend topush the frame forward; As the frame is pushed forward it carries withit the spline-collar, whereupon the teeth upon its front end catch intothe teeth at the rear end of the loose collar carrying the skewgearwheel, forming a clutch, so that when from the slanting toothedgear-wheel on the main shaft the skew gear-wheel and collar on thescrew-shaft are turned the spline-collar will be turned, and by it theshaft; but when the frame is pushed backward it carries back with it thespline-collar, whereupon the teeth upon its front end part fromengagement with the teeth at the rear end of the loose collar carryingthe skew gear-wheel, uncoupling the clutch, so thatwhen from the skewgear-wheel on. the main shaft the skew gear-wheel and the collar on thescrew-shaft are turned these will turn idly and the shaft will not beturned.

The connecting-frame has at its front end another pin 0 which projectsinto the tube of the drill or into a channel h along the under sidethereof. In the lower part of the tube or in the channel is a rod 71,which abuts against the pin of the frame, the other end being attachedby means of a collar h surrounding it, to the drill shaft to be movedlongitudinally thereby. Fixed in the tubeis a disk 71, through which theshaft passes freely, and outside of the collar the shaft has anenlargement 71 which bears against the collar. Between the collar andthe disk the shaft is surrounded by a strong coil-spring, and into theend of the tube is screwed an end bearing for the drill-shaft, thedrill-shaft having screwed upon its end a square socket 71 to receiveand hold the drilltool.

It will be obvious that when the drill is pushed backward against thespring, as by excessive resistance, which would otherwise result in morerapid feed of the machine than penetration of the drill-tool, the rodwill push against the front pin of the frame and the frame will uncouplethe clutch, thus stopping the feed automatically.

To arrest the feed by hand there is provided a cam-shaft 72, the cam 7of which takes over the rear cross-piece of the connectingframe. Theshaft is provided with a handle h 'outside the housing. By turning thehandle, bringing the broader part of the cam against the cross-piece ofthe frame, the frame will be drawn backward and the clutch uncoupled.Upon turning the handle, bringing the narrow part or edge of the camagainst the cross-piece of the frame, the frame will be thrown forwardby the springs at the rear and the clutch uncoupled.

Of the striking mechanism,'to which the drill is here shown applied, A Adesignate two hammers having enlarged portions or heads a a providedwith pins a a, and one or more reduced portions each or stems a a",provided with outward facing rounded notches a a near their ends. Thehammers are mounted one above the other, but free to slide independentlylengthwise in a movable frame B, consisting of two portionsan uprightportion 17 and a forwardly-extendin g portion b the extension having atthe side of each hammer an inwardly-projecting longitudinal tongue orguide-rib b", which takes into a corresponding groove a to steady eachhammer and hold it in proper position against individual displacement toor from the line of strokethat is, in the present embodiment, againstdisplacement up or down,as the hammers in this instance are shown oneabove the other, though they may be side by sidethe movable framehaving, furthermore, tubes 19 b fixed in the front face of the mainportion 1) toward the hammers,and which the ends of the stems of thehammers enter free to slide therein. Upon the stems of the hammers arespiral springs 0 G which abut at one end against the front face of themovable frame over the tubes and at the other against the enlargementsor heads of the hammers, these springs being the hammer-actuatingsprings. The movable frame has grooves 17 in the sides of the uprightportion to permit the frame to be guided in its movement, and

. has, furthermore, an arm b fixed in it near its top and projectingbackward beyond its rear face, by which arm the frame can be moved, andrecesses 19 b in the rear face, respectively from above downward andfrom below upward, each recess ending in a rounded opening, into which atube is set, the recesses containing locking levers or pawls Z1 1) toengage the notches in the stems of the hammers, as shown in Fig. 13, thelevers carrying rollers that enter the notches, in order that uponpressure of the levers outward the pawls may readily slip out ofengagement with the hammers and release them to be actuated by thesprings, and having their free ends projecting beyond the plane of therear face of the movable frame to be struck and thrown out of engagementwith the notches.

Behind the movable frame is the stationary frame or the block D,consisting of a main portion d and upright strips or pieces d confiningthe shafts at their bearings in the frame. the main portion (1! having arecess or jaw (1 into which the movable frame is set, with its groovesupon guide-bars d and with its arm in a cleft d Projecting into thejawfrom the top and bottom of the block are springs d (F, which, beingopposite the recess in the movable frame, are in position to act againstthe locking-levers as required, the locking-levers being thrown out ofengagement with their notches in the hammers by striking against stops dSet into the block at the rear and at its lower part is the main shaftE, having spur gear-wheels e e and cranks or crank-bends e c also a came and above the main shaft a second shaft F, with spur gear-wheels f P,the gear-wheels e and f and e and f ,respective1y,0n the two shaftsin-termeshing, cranks f f at the ends of the shaft, and a crank fbetween the gearwheels or intermediate in the length of the shaft, thetwo shafts being so geared that the cranks or crank-bends on the mainshaft and the cranks on the ends of the second shaft will berespectively in position relatively diametrically opposite, and thecranks carrying links G G which turn on them atone end (the rear end)and at the other end take over the pins on the hammer-heads, the crankson the main shaft bearing the links which take over the pins on the headof the lower hammer and those on the second shaft carrying the linkswhich take over the pins on the head of the upper hammer. It will beobvious that as the main shaft revolves the hammers will be drawn backone after the other by the links. Upon the intermediate crank of thesecond shaft is journaled a box f into which an arm I) passes throughthe cleft (1 the box sliding slightly but freely on the arm. It. will beobvious that as the second shaft is turn ed and its intermediate crankor crank-bend revolves with its box the arm will be moved up and down,carrying with it the movable frame, which is in this manner moved up anddown, whereby the hammers by it carried will be reciprocated, and therewill be a period of rest at the end of each movement up or down beforethe opposite movement begins, it being clear that the period of rest maybe made greater or less by well-known meansfor example, greater byhaving the box larger in vertical diameter than the end of the arm. V

As already described, the stems of the hammers are provided near theirends with notches and the movable frame with pawls. Now the intermediatecrank on the second shaft is so set that when the upper hammer is drawnback, with its spring or springs compressed to the fullest extent, themovable frame will be at its uppermost limit of motion, bringing theupper pawl or pawls against the upper pawl spring or springs and forcingthe pawls into the notch or notches of the upper hammer, retaining ituntil, upon movement of the frame in its contrary direction, aboutcentrally, the pawl or pawls will strike against the stop on thestationary frame, and, releasing the stem or stems, the upper hammerwill be shot forward by the actuating spring or springs to deliver itsblow, while when the lower hammer is drawn back, with its spring orsprings compressed to the fullest extent, the movable frame will be atits lowermost limit of motion, bringing the lower pawl or pawls againstthe lower pawl spring or springs and forcing the pawl into the notch ornotches of the lower hammer, retaining it until, upon movement of theframe in the contrary direction, about centrally, the pawl or pawls willstrike against the projection on the stationary frame, and, releasingthe stem or stems, the lower hammer will be shot forward by theactuating spring or springs to deliver its blow. Otherwise stated, theshafts are so geared with each other that they act upon the respectiveactuating-springs through their cranks and connecting-links alternately,and the box mounted on the shaft is so arranged with relation to theother moving parts of the machine and its operation is so timed thateach hammer, respectively, is at the outward limit of the motion of theframe farthest removed from the drill-tool or part holding thedrill-tool when its spring is compressed and the notch in the hammer isentered by its pawl, and it is carried to a point opposite thedrill-tool when its locking-lever is moved from the hammer releasing it.

It may be here noted that delivery of ablow takes place at a time whenthe reciprocatingly-moving frame, having reached its extreme position inone direction or the other, is about to retrace its coursethat is, at amoment when it is deprived of motionhaving no motion either in onedirection or the other. The delivery of the blow beingpractically'instantaneous under the quick action of the springs, it maybe said that the movement of the hammer at that time is all in onedirection-that is, in the direction of the object to be struck.

The advantage of reciprocation of the operative part to and from theline of direction of its action is, first, that by reciprocation morethan one hammer can be employed, instead of having to use a singlehammer, thus dividing the labor and consequent wear and tear, and,secondly that by reciprocation or alternation as distinguished fromconstant motion onward or succession a period of rest is afforded attheend of each 1novement namely, just before return-and just then thestriking can be performed.

It will be obvious that the screw device may be employed for causing thestriking device to advance or recede by itself.

Having thus fully described my invention, whatI claim as new, and desireto secure by Letters Patent, i s- 1. In a rock-drilling machinecomprising a striking device composed of two hammers reciprocating inthe direction of impact and also in a line crossing that of the impact,mechanism for imparting the desired movements to the strikingmechanism,a drill-tool, and a rock-shaft connected to the drill-tool orto a part holding a drill-tool and receiving motion from the operatingmechanism of the striking device, substantially as described.

2. In a rock-drilling machine comprising a striking device composedoftwo hammers reciprocating in the direction of impact and also in a'linecrossing that of impact, mechanism for imparting the desired movementsto the striking mechanism, a drill-tool, and a rock-shaft connected tothe drill-tool or to a part holdinga drill tool bya ratchet-feed andreceiving motion from the operating mechanism of the striking device.

3. In a rock-drilling machine comprising a striking device composed oftwo hammers reciprocating in the direction of impact and also in a linecrossing that of impact, mechanism for imparting the desired movementsto the striking device, a standard upon which the machine is mounted, aconnection between the standard and the operating mechanism of thestriking device, and a screw receiving motion from the operatingmechanism and imparting a longitudinal movement to the connection,substantially as described.

4. In a rock-drilling machine comprising a striking device composed oftwo hammers reciprocating in the direction of impact and also in a linecrossing that of impact, mechanism for imparting the desired movementsto the striking device, a standard upon which the machine is mounted, alongitudinallymovable connection between the standard and the operatingmechanism, and a clutch attaching the connection to the operatingmechanism, substantially as described.

5. In a rock-drilling machine comprising a striking device composed oftwo hammers reciprocating in the direction of impact and also in a linecrossing that of impact, mechanism for imparting the desired movementsto the striking device, a standard upon which the machine is mounted, alongitudinallymovable connection between the standard and the operatingmechanism, a clutch attachin g the connection to the operatingmechanism, a drill-tool holder having a limited longitudinal movement,and a connection between the tool-holder and the clutch, substantiallyas described.

In testimony whereof I affix my signature in

